The transmitting part of
the garage door remote is generally divided into two types, namely, the remote controller
(garage door remote) and the transmitting module. The remote controller and the remote control module are for the use mode. The remote controller can be used independently as a complete machine, and the external outgoing line has a wiring pile head; The remote control module is used as a component in the circuit and is applied according to its pin definition. The advantage of using the remote control module is that it can be seamlessly connected with the application circuit, small volume, low price and make the best use of everything. However, the user must really understand the circuit principle. Otherwise, it is convenient to use the remote control.
Generally speaking, the receiving part of
the garage door remote is also divided into two types, namely
super heterodyne garage door remote and super regenerative receiving mode
garage door remote. The super regenerative demodulation circuit is also called super regenerative detection circuit. In fact, it is a regenerative detection circuit working in the intermittent oscillation state. Superheterodyne demodulation circuit is the same as superheterodyne radio. It is equipped with a local oscillation circuit to generate oscillation signal. After mixing with the received carrier frequency signal, the intermediate frequency (generally 465kHZ) signal is obtained. After intermediate frequency amplification and detection, the data signal is demodulated. Because the carrier frequency is fixed, its circuit is simpler than that of a radio. The superheterodyne receiver has the advantages of stability, high sensitivity and relatively good anti-interference ability; Super regenerative receiver is small and cheap. Easy to solve.
